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There is currently less information available on the structure of 154Dy at low spins. The question still remains whether at low spins the structure exhibits permanent octupole deformation  or aligned tidal wave octupole phonons . Intermediate spins of the nucleus 154Dy were populated via the 155Gd (3He, 4n) 154Dy reaction at 45 MeV at iThemba LABS using AFRODITE array spectrometer. The even-even nucleus 154Dy with 6 neutrons and 2 protons outside the closed shell is nearly spherical. The N = 88 isotones have remarkable features; They are at a peak in the |M(E3)| 2 transition strength of 0+1 → 3-1 transitions for even-even nuclei as a function of neutron number usually called octupole vibration . This was first stated by Chasman theoretically  whereby the first excited states in some nuclei have an octupole deformed first excited state with a quadruple deformation in the ground state and shown experimentally for 154Gd88 . The strong E3 properties have been described and explained as due to the nearness of &Delta J &pi=3 - shell model orbits to the Fermi surface. They also have very strong E0 transitions from the band built on the 0 +2 states to the ground state bands [3, 5]. The measurements we have made on 154Dy are motivated by the findings from our studies of the isotones 152Gd and 150Sm from  where we observed octupole correlations between the 0 +2 states and the lowest-lying negative parity band, commonly known as the octupole band.
 R. R. Chasman, Phys. Rev. Lett. 42, 630 (1979).
 S. Frauendorf, Phys. Rev. C77, 021304(R) (2008).
 S. P. Bvumbi et al., Phys. Rev. C 87, 044333 (2013).
 S P Bvumbi, “Spin and Parity Assignment in 152Gd Investigating Octupole Structures”; MSc thesis, University of Western Cape (2008).
 S. Frauendorf, Y. Gu, J. Sun, Tidal waves as yrast states in transitional nuclei (2007).
 S. P. Bvumbi, “Investigation of octupole correlations and collective couplings in the rare earth nucleus 150Sm” PhD thesis, University of Johannesburg, (2013).
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SUZAN PHUMUDZO BVUMBI
University of Johannesburg
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